General Tools - Free Online Calculation Tools

Solve algebraic equations instantly with detailed steps. Supports linear equations, quadratic formulas, and systems of equations.

Measure distances between points, calculate polygon areas, and convert units instantly. Supports kilometers, miles, acres, and hectares.

Professional tool for calculating image aspect ratios and dimensions.

Professional P value calculator supporting multiple statistical distributions. Get accurate results with visual charts and clear interpretations for hypothesis testing.

Calculate your course grades, convert between percentage and letter grades, estimate GPA with weighted assignments.

Professional BTU calculator for HVAC sizing. Convert between BTU/hr, kW, and tons. Perfect for selecting air conditioners with precise capacity calculations.

Calculate your IRA contribution limits, check Roth IRA eligibility based on income, and project retirement savings growth with our comprehensive tool.

Calculate how inflation affects your money over time.

Calculate the true annual percentage yield (APY) by accounting for compound interest effects.

Calculate all properties of right triangles: sides a,b,c, angles α,β, area, perimeter, height. Includes step-by-step solutions, visual diagrams, supports degrees and radians.

Calculate your maximum Roth IRA contribution for 2026.

Professional cubic yard calculator for accurate material estimation. Calculate volume for concrete, mulch, gravel, and soil.

Free online 1RM calculator supporting Epley, Brzycki, Lombardi and more formulas. Track strength progress with interactive charts and personalized training recommendations.